Headset



FIG. 1 is a perspective view of a headset showing my new design;

FIG. 2 is a side view thereof.

FIG. 3 is another side view thereof.

FIG. 4 is a back view thereof.

FIG. 5 is a front view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines form no part of the claimed design. 

The ornamental design for headset, as shown and described. 